Here's what we did:
I had the kids lay on the canvas one at a time.
I traced their bodies with pencil, then went over the lines with a black paint marker.
Then I had the kids color in their bodies with paint, we definitely had a little confusion, and somebody painted their real belly, when I said add paint to your body
And that's all...
I have to say, I think this was a great idea and the end result is sort of amazing... We are all obsessed with the final product. A fabulous piece of artwork, and a great reminder of how big the kids were this Father's Day.